■ Meet standards：
IEC61215-2 MQT09
IEC61730-2 MST21
IEC61730-2 MST22

■ Purpose：
Determine the ability of the component to withstand the thermal effects of hot spots and evaluate the potential for welding melting or packaging degradation caused by these effects. Battery failure, battery mismatch, exposure to light or dirt can all cause this defect.